Drink coaster



FIG. 1 is a top plan view of a drink coaster showing my design;

FIG. 2 is a bottom plan view thereof;

FIG. 3 is a right side view thereof, the left side being a mirror image thereof;

FIG. 4 is a front end view thereof; and,

FIG. 5 is a back end view thereof. 

The ornamental design for a drink coaster, as shown and described. 